Table for talking machines



Aug. 28', 1923. 1,466,576

v.1. F. BORST ET AL TABLE FOR'TALKING MACHINES WITNESSES IN VEN T053 SEW/50687 "runnin 5 .state.

Patented Aug. 28, 1923. ii

JOSEPH F. BORST AND WILLIAM BURST, or

BRCOKLYN, ,NEW YORK.

was FOR TALKING irAcHINns.

Application filed February. 1,1921

To (in whom it may concern:

Be it known that we, Josnrir F. Bous'r and lVILLiAii now, both citizens of the United States, and residents of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Tablefor Talking Machines, of which the following is a full, clear, and exact description.

The present usefulimprovements in talking machines, and it pertains more particularlyto a new and improved construction of talkng machine table. 1

l/Ve have found by actual experiment that the motor in its operation produces certain. friction, vibration and sounds conveyed to the sound box by the various metal parts. of the mechanism, and which are responsible to a large extent for poor and improper reproduction on the part of the sound box.

We have also found that spring members used in talking machines do not rotate the table at a constant speed. This condition owing to the uneven movement between the record and the stylus, produces objectionable vibration, and be eliminated if the table were driven at constant speed. g

It is, therefore, one of the primary objects of the invention to insulate the diaphragm from friction, vibration and-sounds from the sound box and stylus and various metal parts of the machine. By so doing we control friction, vibration and soundsto-the greatest extent possible, thereby allowing vibration and harmony to act in its clearest With the above and other objects in View, reference is had to the accompanying drawings, in which- Figure 1 is a sectional view of a talking machine table and sound box;

. Fig. 2 is a detail top plan View partly in section of a tableconstructed in accordance with the present invention;

Fig. 3 is a-detail sectional view taken at the central portion of the table.

Referring more particularly. to the draw ings, the reference character 5 designates the motor spindle and 6 designates the table. Secured to theunder face of the table 6,,is

a bearing member 7, and this hearing mom-.-

ber is provided with a continuous channel 8 in its upper face... The bearingmember 7 is cut out as indicated by the reference charsoldering, the same is invention relatesto new and sounds and noises which could cated by the reference that the sulphur 16 may be more securely carried by the table.

Serial in. 441,603.

washers 11 and 12,1'espectively, and said member 7 is secured to the under side of the table (5 in anydesired manner, such as y riveting, or

the like, and before of the table, the channel 8is filled with mercury indicated by the reference character '13. By means of the lead washers 11 and 12, it will beseen that the member 7 and the spindle 5 will be insulated from the table 6 by these lead .vashers, which metal is known to have poor qualities for the transmission of friction, vibration and sounds.- The mercury inlthe channel '8'serves as a counterbalance for the turntable, and owing to the mercury beingmobile under the influence of the rotation of the table, thelatter rotates at a constantspeed. r I

' Asmore clearly shown in Fig. 2,'the table 6 is provided upon its upper face at its central point, witha depressed circularportion 15, andniounted in said depressed portion 15, is .a suitable material 16, which has poor qualities for transmitting vibration, and sound. Vi e have found by experiment that sulphur serves this purpose best, and it is this material which is used, the same being heated to a plastic state and placed within seen that this groove or channel 15 is con centric with the channel 8 in which the -mer cury '13 is carried, and immediately above the mercury 13. Branching off from this circular portion 15 of sulphur 16, at equidistantly spaced intervals, are legs 20, and said legs 20 are formed from sulphur, the table being depressed as indicharacter-21 in order After the central circular member 15 and the radial legs 20 have been formed, the entire table is covered with felt or the like 25, as is the common practice.

Referring to Fig. l, the reference character 30 designates the sound box and 31 designates phragm is mounted in the sound box 30 between the two circular rings 32 of sulphur,

itbeing understood that the diaphragm 31 does not contact directly with the rings of sulphur 32, there being a suitable thickness of felt interposed between the diaphragm and the rings 32 upon each sideof the diaphragm. Extending from the rear of the positioned upon theunder side that the sulphur 16 is ,acters 9 and 10 for the reception of lead n the diaphragm thereof. This diasound box 30, is a tone arm 33, and said tone arm 33 is flanged as at 34 to provide for its attachment to the rear Wall of the sound box. lnterposed between the flange 3-1 and the rear wall of the sound box 80, is a sulphur Washer, and upon opposite sidesot said sulphur Washer are disks 36 of lielt or the like. .lxt any screws be present to hold the sound box to the tone arm, we insulate the same by felt washers or the like.

The reference character ell) lesignates the stylus bar pirotally mounted as at 4:1 to the sound he); 30, and having its innermost end rigidly secured to the diaphragm as at L2. The common practice olt securing the stylus bar ll) to the diaphragm 31, as by means of a rivet or the like, \vl ich We line with telt, but in the present instance in order that the diaphragm may be thoroughly insulated, the inner end of the stylus bar is secured to the diaphragm by means of sulphur, it being undcrstood that the sulphur heated and ap plied in a plastic state.

From the above it will be apparent that the friction and the vibration generated in the motor during the operation thereof, are insulated :trom the record tablet (the same being indicated by the reference character 15), by reason oi the fact that the tablet is supported upon the legs formed of the sul phur 1(3 and out of communication with. the table (3. The construction of the table mounting, i. e., the bearing member 7 With the lead washers 9 and 10, also serves to insulate the table to aeertain degree from the friction and vibration generated in the motor.

The noises and vibration or' the motor which pass in the opposite direction and through the tone arm will be insulated from the sound box by means of the sulphur washer interposed between the sound box 30 and the flange 3% oi? the tone arm 38.

ihe friction, vibration and sounds incident to the frictional contact oi? the stylus with the record will. be prevented from being transmitted to the diaphragm 31 by reason of the sulphur 41-2 which secures the stylus bar to the diaphragm 31., and the diaphragm 3i. is 'lurthcr insulated by means of the sulphur Washers 32 between which it is mounted. "fe find that it is most capable for holding purposes in this position, as it steadfast to Weather, vibration and such, as We Well. know rubber or the like being; used in the same position not steadtast to \fveather, ribratiou or the like.

From the 'l oregoing it is apparent that all of the metal parts of the reproducing mechanism of a talking machine constructed in accordance with the present invention are insulated one from the other by a suitable material, the transmission qualities of which are extremely low, which construction leaves the diaphragm tree from exterior friction, and sounds and oerinits the same to properly function and consequently render a clearer irproduetion.

We claim:

In a talking machine, a record supporting table, a mount therefor, said mount comprisin; a, bearing member for supporting said record table and secured to the under i'are thereo'l, a continuous circular groove formed in the bearing member in its table engaging face, and mccury -arried in said groove and freely movable with respect thereto, as and. for the purpose set forth.

JOSEPH F. BORST. WILLIAM BORQT. 

